A Transmitter Modulating Device for the Study of the Kennelly-Heaviside Layer by the Echo Method

1 June 1928

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IRE

Vol. 16 (6) , 794-798
https://doi.org/10.1109/JRPROC.1928.221470

Abstract

The importance is emphasized of sending out "peaks" of very short duration and proper spacing for the study of the radio reflections from the ionized layer in the upper atmosphere by the echo method, and objections to modified alternating-current modulation are pointed out. A method is outlined for modulating the transmitter, based on the sudden pulses of plate-current which occur in an unbalanced multivibrator circuit. The application of this method to the transmitter is described and its effectiveness illustrated by typical recorded signals.

Keywords

RADIO TRANSMITTERS
RECEIVERS
ATMOSPHERE
PULSE MODULATION
PULSE CIRCUITS
FREQUENCY
REFLECTION
MAGNETIC MODULATORS
VOLTAGE
INTERFERENCE ELIMINATION

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